SERVICING YOUR SUPERMAX
33
4. Make sure that the pulleys are in alignment by
holding a straightedge across their flat sides and
adjusting to it. Also check that all bolts are tight
before using the sander.
ROTATING/REPLACING DRUM BEARINGS
Replacing the permanently lubricated drum bear-
ings on the SUPERMAX sander is a relatively
straight-forward procedure. Bearings should be
replaced when they allow excessive play of the
drum, make excessive noise, or otherwise indicate
failure.
Note that if clicking noises in the bearings are a
problem, rotating may be a solution instead of
replacement, as follows (See Fig. 40):
Rotating Bearings
Step 1. Loosen the set screws in the bearing collar.
Leave the allen wrench in one of the set screws.
Then rotate the drum within the bearing and
tighten the set screws.
Step 2. If the clicking persists, or if the drum shaft
is tight in the bearing and cannot rotate, then
loosen the two bolts holding the bearing and the
flange for the bearing. Now repeat Step 1. After
the drum is rotated within the bearing, tighten the
flanges first and then the set screws. Note: After
tightening the rear bolt in the flange, loosen it
approximately 1/4 turn, which allows the rear
drum to pivot. After the machine has run for a
half hour, stop to check that the set screws and
bearing bolts are tight.
The general procedure outlined below suggests
replacing bearings on the left (outboard) side, one
at a time, starting with the rear drum of dual
drum sanders, then moving to the front drum.
Then, if needed, proceed to the right (inboard)
side, also working on the rear drum of dual drum
sanders first, then the front drum.
Disassembly Procedure
1. To begin the procedure in all cases, disconnect
power to sander.
2. Remove the outer belt guard cover by removing
the two 5/16" x 1/2" hex head bolts holding it in
place, then the four 10-32 screws in the lower half.
Slide the middle section back and the outer guard
to the side.
Fig. 39. Supporting drums to remove bearings.
3. Loosen the pinch bolt of the motor support
casting and raise the motor to loosen the V-belt.
4. Next, level the drums to each other (see pages 7
and 8 in this manual). Then raise the conveyor
bed until the drum(s) rest on the conveyor bed.
With this done, follow the steps below:
Fig. 40. Locating bearing set screws.
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